ERD, 即 entity Relationship diagram, 实体关系图。使用一组定义的符号,如矩形、菱形、椭圆和连接线来描述实体、关系及其属性的相互联系。 ER图的组成部分 ER 图由实体、关系和属性组成。 并且不同的记法有不同的符号。 这里介绍比较常用的两种技法:Chen notation style和Crow's Foot style Chen notation style P...
> Entity Relationship Diagram (ERD) Posted by Allison Lynch | Part 1: What Is An Entity Relationship Diagram? Part 2: History Of Entity Relationship Diagrams Part 3: Usage of an ER Diagram Part 4: Benefits of Entity Relationship Diagram Part 5: Symbols and Notations of Entity ...
ERD stands for entity relationship diagram. People also call these types of diagrams ER diagrams and Entity Relationship Models. An ERD visualizes the relationships between entities like people, things, or concepts in a database. An ERD will also often visualize the attributes of these entities. ...
ERD 教程:Entity Relationship Diagram - Everything You Need to Know About ERD... 图片来自: 数据库系统概论(第5版) Systems Analysis & Design Methods: Jeffrey L. Whitten, Lonnie ... 顺便收藏一款画图工具 smartdraw: SmartDraw - Create Flowcharts, Floor Plans, and Other Diagrams on Any Device...
要创建ERD,请从工具栏中选择图表>新建。在New Diagram窗口中,选择Entity Relationship Diagram,然后单击Next。输入巴士路线管理作为图表名称,然后单击确定。 我们首先创建第一个实体Route。在图表工具栏中选择实体,然后点击图表创建一个实体。命名实体Route并按Enter确认。
What is ERD? ERD, namely entity Relationship diagram, entity relationship diagram. Use a defined set of symbols such as rectangles, diamonds, ellipses, and connecting lines to describe the interconnection of entities, relationships, and their properties. ...
ERD 教程:Entity Relationship Diagram - Everything You Need to Know About ERD... 图片来自: 数据库系统概论(第5版) Systems Analysis & Design Methods: Jeffrey L. Whitten, Lonnie ... 顺便收藏一款画图工具 smartdraw: SmartDraw - Create Flowcharts, Floor Plans, and Other Diagrams on Any Device...
Use drag-and-drop tools to define connections as a one-to-one relationship, one-to-many relationship (often captured in crow’s foot notation), or many-to-many relationship. Why ER diagrams matter ERDs lay the groundwork for digital products and information systems. They help you figure out...
Create an ERD Directly in Confluence Entity relationship diagrams can be a valuable tool for technical documentation, especially when you need to communicate details about a database to team members or other business stakeholders. Gliffy makes it easy to visualize your database alongside the rest of...
实体关系图(Entity-Relationship Diagram, ERD) 实体关系图包括:数据对象、描述数据对象的属性以及数据对象之间的关系。 www.slideshare.net|基于10个网页 2. 实体关联图 「实体关联图」(Entity-relationship Diagram, ERD)是使用图形表示资料库的结构,主要的目的是显示资料库各资料表间的关 … ...